Table 2.

Crude association between serum 25-hydroxyvitamin D [25(OH)D] level and latent TB infection

Characteristics	Crude OR (95% CI)	Crude OR (95% CI), by gender		Crude OR (95% CI), by season
All sample	Male	Female	Summer	Winter
Continuous serum 25(OH)D level
Per 10 ng/mL increase	0.76 (0.64–0.89)	0.75 (0.58–0.97)	0.77 (0.64–0.93)	0.80 (0.72–0.89)	0.76 (0.59–0.98)
Categorical serum 25(OH)D level
<12 ng/mL	2.70 (1.59–4.60)	3.16 (1.73–5.79)	2.33 (1.19–4.57)	1.89 (1.21–2.95)	3.48 (1.91–6.33)
12–19 ng/mL	2.06 (1.38–3.08)	2.30 (1.42–3.75)	1.80 (1.09–2.96)	1.54 (1.06–2.25)	2.36 (1.56–3.58)
20–29 ng/mL	1.48 (0.94–2.34)	1.58 (0.91–2.75)	1.33 (0.79–2.23)	1.12 (0.72–1.74)	1.74 (1.01–3.03)
≥30 ng/mL	1.0	1.0	1.0	1.0	1.0